Can Go Dynamically Create Methods at Runtime?

Creating Methods Dynamically in Go

In Go, the reflect.MakeFunc function allows for dynamic creation of functions. However, can we extend this capability to create methods (functions with receivers) at runtime?

The Answer:

No, it's not directly possible in Go to create methods dynamically. This stems from the fact that Go's type-checking occurs during compilation, and if types could gain or lose methods at runtime, it would necessitate interface-implementation checks for every interface argument in function calls.

Possible Workaround:

While it's impossible to create actual methods dynamically, it's possible to construct a value representing a method attached to any given type. This involves modifying the reflect package's code. However, it should be noted that this would be a circumvention of Go's type system and wouldn't actually change the method set of the type.

Object Method Swapping:

Another alternative is to swap method pointers on an object. Unlike languages like Java, Go doesn't embed virtual method dispatch tables in concrete values, only in interface values. By obtaining a reflect.nonEmptyInterface and modifying its itable field, it's possible to alter the method behavior of an object dynamically.

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